/**
 * 获取俩点间得距离
 * @param lat1
 * @param lng1
 * @param lat2
 * @param lng2
 * @returns {Promise<number>}
 */
async function  getDistance( lat1,  lng1,  lat2,  lng2){
    const radLat1 = lat1 * Math.PI / 180.0;
    const radLat2 = lat2 * Math.PI / 180.0;
    const a = radLat1 - radLat2;
    const b = lng1 * Math.PI / 180.0 - lng2 * Math.PI / 180.0;
    let s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2) +
        Math.cos(radLat1) * Math.cos(radLat2) * Math.pow(Math.sin(b / 2), 2)));
    s = s *6378.137 ;// EARTH_RADIUS;
    s = Math.round(s * 10000) / 10000;
    return s;
}
export {
    getDistance
}
